Pith Number

pith:X7GF4L2O

pith:2013:X7GF4L2OIJN4A2SPFAS4AYNSIE

not attested not anchored not stored refs pending

The UVES Large Program for Testing Fundamental Physics: I Bounds on a change in alpha towards quasar HE 2217-2818

C. J. A. P. Martins, D. Reimers, G. Vladilo, H. Rahmani, I. I. Agafonova, J. B. Whitmore, M. Centurion, M. T. Murphy, M. Wendt, P. Bonifacio, P. Molaro, P. Petitjean, R. Srianand, S. A. Levshakov, S. D'Odorico, S. Lopez, T. M. Evans

arxiv:1305.1884 v1 · 2013-05-08 · astro-ph.CO

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{X7GF4L2OIJN4A2SPFAS4AYNSIE}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T01:50:04.648141Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

bfcc5e2f4e425bc06a4f2825c061b2413ad65c49aaf91f92e71ff2e400f118da

Aliases

arxiv: 1305.1884 · arxiv_version: 1305.1884v1 · doi: 10.48550/arxiv.1305.1884 · pith_short_12: X7GF4L2OIJN4 · pith_short_16: X7GF4L2OIJN4A2SP · pith_short_8: X7GF4L2O

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/X7GF4L2OIJN4A2SPFAS4AYNSIE \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: bfcc5e2f4e425bc06a4f2825c061b2413ad65c49aaf91f92e71ff2e400f118da

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "15a2a11ab994fb61ab38baee6028beb19ffdbb80a11a55b5d383889f84495572",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2013-05-08T16:59:46Z",
    "title_canon_sha256": "3b3ef9ba43eab9c42e74e888e11febda60b27c9d213a1b91f0913f58605395f7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1305.1884",
    "kind": "arxiv",
    "version": 1
  }
}